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MOV/GEC valve, type R, painted X1.22 in red and R.P.1 Science Museum Group © The Board of Trustees of the Science Museum
MOV/GEC valve, type R, painted X1.22 in red and R.P.1. in white, pinch marked R and 2174, (RMW/Y23 - McVitie Weston number), by M-O Valve Co. Limited; General Electric Company Limited.